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-rw-r--r--fs/posix_acl.c147
1 files changed, 106 insertions, 41 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 962d32468eb4..d954852a0158 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -375,8 +375,7 @@ posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
goto check_perm;
break;
case ACL_USER:
- uid = mapped_kuid_fs(mnt_userns,
- i_user_ns(inode),
+ uid = mapped_kuid_fs(mnt_userns, &init_user_ns,
pa->e_uid);
if (uid_eq(uid, current_fsuid()))
goto mask;
@@ -390,8 +389,7 @@ posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
}
break;
case ACL_GROUP:
- gid = mapped_kgid_fs(mnt_userns,
- i_user_ns(inode),
+ gid = mapped_kgid_fs(mnt_userns, &init_user_ns,
pa->e_gid);
if (in_group_p(gid)) {
found = 1;
@@ -710,46 +708,127 @@ EXPORT_SYMBOL(posix_acl_update_mode);
/*
* Fix up the uids and gids in posix acl extended attributes in place.
*/
-static void posix_acl_fix_xattr_userns(
- struct user_namespace *to, struct user_namespace *from,
- struct user_namespace *mnt_userns,
- void *value, size_t size, bool from_user)
+static int posix_acl_fix_xattr_common(void *value, size_t size)
+{
+ struct posix_acl_xattr_header *header = value;
+ int count;
+
+ if (!header)
+ return -EINVAL;
+ if (size < sizeof(struct posix_acl_xattr_header))
+ return -EINVAL;
+ if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
+ return -EINVAL;
+
+ count = posix_acl_xattr_count(size);
+ if (count < 0)
+ return -EINVAL;
+ if (count == 0)
+ return -EINVAL;
+
+ return count;
+}
+
+void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+ const struct inode *inode,
+ void *value, size_t size)
{
struct posix_acl_xattr_header *header = value;
struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end;
int count;
+ vfsuid_t vfsuid;
+ vfsgid_t vfsgid;
kuid_t uid;
kgid_t gid;
- if (!value)
+ if (no_idmapping(mnt_userns, i_user_ns(inode)))
return;
- if (size < sizeof(struct posix_acl_xattr_header))
+
+ count = posix_acl_fix_xattr_common(value, size);
+ if (count < 0)
return;
- if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
+
+ for (end = entry + count; entry != end; entry++) {
+ switch (le16_to_cpu(entry->e_tag)) {
+ case ACL_USER:
+ uid = make_kuid(&init_user_ns, le32_to_cpu(entry->e_id));
+ vfsuid = make_vfsuid(mnt_userns, &init_user_ns, uid);
+ entry->e_id = cpu_to_le32(from_kuid(&init_user_ns,
+ vfsuid_into_kuid(vfsuid)));
+ break;
+ case ACL_GROUP:
+ gid = make_kgid(&init_user_ns, le32_to_cpu(entry->e_id));
+ vfsgid = make_vfsgid(mnt_userns, &init_user_ns, gid);
+ entry->e_id = cpu_to_le32(from_kgid(&init_user_ns,
+ vfsgid_into_kgid(vfsgid)));
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+void posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+ const struct inode *inode,
+ void *value, size_t size)
+{
+ struct posix_acl_xattr_header *header = value;
+ struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end;
+ int count;
+ vfsuid_t vfsuid;
+ vfsgid_t vfsgid;
+ kuid_t uid;
+ kgid_t gid;
+
+ if (no_idmapping(mnt_userns, i_user_ns(inode)))
return;
- count = posix_acl_xattr_count(size);
+ count = posix_acl_fix_xattr_common(value, size);
if (count < 0)
return;
- if (count == 0)
+
+ for (end = entry + count; entry != end; entry++) {
+ switch (le16_to_cpu(entry->e_tag)) {
+ case ACL_USER:
+ uid = make_kuid(&init_user_ns, le32_to_cpu(entry->e_id));
+ vfsuid = VFSUIDT_INIT(uid);
+ uid = from_vfsuid(mnt_userns, &init_user_ns, vfsuid);
+ entry->e_id = cpu_to_le32(from_kuid(&init_user_ns, uid));
+ break;
+ case ACL_GROUP:
+ gid = make_kgid(&init_user_ns, le32_to_cpu(entry->e_id));
+ vfsgid = VFSGIDT_INIT(gid);
+ gid = from_vfsgid(mnt_userns, &init_user_ns, vfsgid);
+ entry->e_id = cpu_to_le32(from_kgid(&init_user_ns, gid));
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+static void posix_acl_fix_xattr_userns(
+ struct user_namespace *to, struct user_namespace *from,
+ void *value, size_t size)
+{
+ struct posix_acl_xattr_header *header = value;
+ struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end;
+ int count;
+ kuid_t uid;
+ kgid_t gid;
+
+ count = posix_acl_fix_xattr_common(value, size);
+ if (count < 0)
return;
for (end = entry + count; entry != end; entry++) {
switch(le16_to_cpu(entry->e_tag)) {
case ACL_USER:
uid = make_kuid(from, le32_to_cpu(entry->e_id));
- if (from_user)
- uid = mapped_kuid_user(mnt_userns, &init_user_ns, uid);
- else
- uid = mapped_kuid_fs(mnt_userns, &init_user_ns, uid);
entry->e_id = cpu_to_le32(from_kuid(to, uid));
break;
case ACL_GROUP:
gid = make_kgid(from, le32_to_cpu(entry->e_id));
- if (from_user)
- gid = mapped_kgid_user(mnt_userns, &init_user_ns, gid);
- else
- gid = mapped_kgid_fs(mnt_userns, &init_user_ns, gid);
entry->e_id = cpu_to_le32(from_kgid(to, gid));
break;
default:
@@ -758,34 +837,20 @@ static void posix_acl_fix_xattr_userns(
}
}
-void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size)
+void posix_acl_fix_xattr_from_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
-
- /* Leave ids untouched on non-idmapped mounts. */
- if (no_idmapping(mnt_userns, i_user_ns(inode)))
- mnt_userns = &init_user_ns;
- if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
+ if (user_ns == &init_user_ns)
return;
- posix_acl_fix_xattr_userns(&init_user_ns, user_ns, mnt_userns, value,
- size, true);
+ posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
}
-void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size)
+void posix_acl_fix_xattr_to_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
-
- /* Leave ids untouched on non-idmapped mounts. */
- if (no_idmapping(mnt_userns, i_user_ns(inode)))
- mnt_userns = &init_user_ns;
- if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
+ if (user_ns == &init_user_ns)
return;
- posix_acl_fix_xattr_userns(user_ns, &init_user_ns, mnt_userns, value,
- size, false);
+ posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
}
/*
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 00:59:34 +0000